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Documents authored by Hou, Ping

Document
DOI: 10.4230/LIPIcs.ECOOP.2024.19
Fearless Asynchronous Communications with Timed Multiparty Session Protocols

Authors: Ping Hou, Nicolas Lagaillardie, and Nobuko Yoshida

Published in: LIPIcs, Volume 313, 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract
Session types using affinity and exception handling mechanisms have been developed to ensure the communication safety of protocols implemented in concurrent and distributed programming languages. Nevertheless, current affine session types are inadequate for specifying real-world asynchronous protocols, as they are usually imposed by time constraints which enable timeout exceptions to prevent indefinite blocking while awaiting valid messages. This paper proposes the first formal integration of affinity, time constraints, timeouts, and time-failure handling based on multiparty session types for supporting reliability in asynchronous distributed systems. With this theory, we statically guarantee that asynchronous timed communication is deadlock-free, communication safe, while being fearless - never hindered by timeout errors or abrupt terminations. To implement our theory, we introduce MultiCrusty^T, a Rust toolchain designed to facilitate the implementation of safe affine timed protocols. MultiCrusty^T leverages generic types and the time library to handle timed communications, integrated with optional types for affinity. We evaluate MultiCrusty^T by extending diverse examples from the literature to incorporate time and timeouts. We also showcase the correctness by construction of our approach by implementing various real-world use cases, including protocols from the Internet of Remote Things domain and real-time systems.
Cite as

Ping Hou, Nicolas Lagaillardie, and Nobuko Yoshida. Fearless Asynchronous Communications with Timed Multiparty Session Protocols. In 38th European Conference on Object-Oriented Programming (ECOOP 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 313, pp. 19:1-19:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@InProceedings{hou_et_al:LIPIcs.ECOOP.2024.19,
  author =	{Hou, Ping and Lagaillardie, Nicolas and Yoshida, Nobuko},
  title =	{{Fearless Asynchronous Communications with Timed Multiparty Session Protocols}},
  booktitle =	{38th European Conference on Object-Oriented Programming (ECOOP 2024)},
  pages =	{19:1--19:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-341-6},
  ISSN =	{1868-8969},
  year =	{2024},
  volume =	{313},
  editor =	{Aldrich, Jonathan and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2024.19},
  URN =		{urn:nbn:de:0030-drops-208681},
  doi =		{10.4230/LIPIcs.ECOOP.2024.19},
  annote =	{Keywords: Session Types, Concurrency, Time Failure Handling, Affinity, Timeout, Rust}
}
Document
Artifact
DOI: 10.4230/DARTS.10.2.10
Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact)

Authors: Nicolas Lagaillardie, Ping Hou, and Nobuko Yoshida

Published in: DARTS, Volume 10, Issue 2, Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract
We introduce MultiCrusty^T, a Rust toolchain designed to facilitate the implementation of safe affine timed protocols. MultiCrusty^T leverages generic types and the time library to handle timed communications, integrated with optional types for affinity. This artifact allows to evaluate our approach by running examples from the literature, real-world use cases and protocols from real-time systems, featured in the related article, showcasing the correctness by construction of our approach. We allow to see the performance of our solution by running benchmarks and generating graphs, highlighting a less than 10% compile-time and runtime overhead compared with an untimed implementation. We also demonstrate how to implement, step by step, your own timed protocols, from a very basic one with only two parties and simple interactions, to complex ones with more than three parties, choices and recursion.
Cite as

Nicolas Lagaillardie, Ping Hou, and Nobuko Yoshida. Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact). In Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024). Dagstuhl Artifacts Series (DARTS), Volume 10, Issue 2, pp. 10:1-10:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{lagaillardie_et_al:DARTS.10.2.10,
  author =	{Lagaillardie, Nicolas and Hou, Ping and Yoshida, Nobuko},
  title =	{{Fearless Asynchronous Communications with Timed Session Types in Rust (Artifact)}},
  pages =	{10:1--10:3},
  journal =	{Dagstuhl Artifacts Series},
  ISBN =	{978-3-95977-342-3},
  ISSN =	{2509-8195},
  year =	{2024},
  volume =	{10},
  number =	{2},
  editor =	{Lagaillardie, Nicolas and Hou, Ping and Yoshida, Nobuko},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.10.2.10},
  URN =		{urn:nbn:de:0030-drops-209084},
  doi =		{10.4230/DARTS.10.2.10},
  annote =	{Keywords: session types, affine types, \pi-calculus, asynchrony, timeouts, failures, Rust}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2023.1
Designing Asynchronous Multiparty Protocols with Crash-Stop Failures

Authors: Adam D. Barwell, Ping Hou, Nobuko Yoshida, and Fangyi Zhou

Published in: LIPIcs, Volume 263, 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
Session types provide a typing discipline for message-passing systems. However, most session type approaches assume an ideal world: one in which everything is reliable and without failures. Yet this is in stark contrast with distributed systems in the real world. To address this limitation, we introduce Teatrino, a code generation toolchain that utilises asynchronous multiparty session types (MPST) with crash-stop semantics to support failure handling protocols. We augment asynchronous MPST and processes with crash handling branches. Our approach requires no user-level syntax extensions for global types and features a formalisation of global semantics, which captures complex behaviours induced by crashed/crash handling processes. The sound and complete correspondence between global and local type semantics guarantees deadlock-freedom, protocol conformance, and liveness of typed processes in the presence of crashes. Our theory is implemented in the toolchain Teatrino, which provides correctness by construction. Teatrino extends the Scribble multiparty protocol language to generate protocol-conforming Scala code, using the Effpi concurrent programming library. We extend both Scribble and Effpi to support crash-stop behaviour. We demonstrate the feasibility of our methodology and evaluate Teatrino with examples extended from both session type and distributed systems literature.
Cite as

Adam D. Barwell, Ping Hou, Nobuko Yoshida, and Fangyi Zhou. Designing Asynchronous Multiparty Protocols with Crash-Stop Failures. In 37th European Conference on Object-Oriented Programming (ECOOP 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 263, pp. 1:1-1:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{barwell_et_al:LIPIcs.ECOOP.2023.1,
  author =	{Barwell, Adam D. and Hou, Ping and Yoshida, Nobuko and Zhou, Fangyi},
  title =	{{Designing Asynchronous Multiparty Protocols with Crash-Stop Failures}},
  booktitle =	{37th European Conference on Object-Oriented Programming (ECOOP 2023)},
  pages =	{1:1--1:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-281-5},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{263},
  editor =	{Ali, Karim and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2023.1},
  URN =		{urn:nbn:de:0030-drops-181944},
  doi =		{10.4230/LIPIcs.ECOOP.2023.1},
  annote =	{Keywords: Session Types, Concurrency, Failure Handling, Code Generation, Scala}
}
Document
Artifact
DOI: 10.4230/DARTS.9.2.9
Designing Asynchronous Multiparty Protocols with Crash-Stop Failures (Artifact)

Authors: Adam D. Barwell, Ping Hou, Nobuko Yoshida, and Fangyi Zhou

Published in: DARTS, Volume 9, Issue 2, Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023)

Abstract
We introduce Teatrino, a toolchain that supports handling multiparty protocols with crash-stop failures and crash-handling behaviours. Teatrino accompanies the novel MPST theory in the related article, and enables users to generate fault-tolerant protocol-conforming Scala code from Scribble protocols. Local types are projected from the global protocol, enabling correctness-by-construction, and are expressed directly as Scala types via the Effpi concurrency library. Teatrino extends both Scribble and Effpi with support for crash-stop behaviour. The generated Scala code is executable and can be further integrated with existing systems. The accompanying theory in the related article guarantees deadlock-freedom and liveness properties for failure handling protocols and their implementation. This artifact includes examples, extended from both session type and distributed systems literature, featured in the related article.
Cite as

Adam D. Barwell, Ping Hou, Nobuko Yoshida, and Fangyi Zhou. Designing Asynchronous Multiparty Protocols with Crash-Stop Failures (Artifact). In Special Issue of the 37th European Conference on Object-Oriented Programming (ECOOP 2023). Dagstuhl Artifacts Series (DARTS), Volume 9, Issue 2, pp. 9:1-9:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@Article{barwell_et_al:DARTS.9.2.9,
  author =	{Barwell, Adam D. and Hou, Ping and Yoshida, Nobuko and Zhou, Fangyi},
  title =	{{Designing Asynchronous Multiparty Protocols with Crash-Stop Failures (Artifact)}},
  pages =	{9:1--9:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2023},
  volume =	{9},
  number =	{2},
  editor =	{Barwell, Adam D. and Hou, Ping and Yoshida, Nobuko and Zhou, Fangyi},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.9.2.9},
  URN =		{urn:nbn:de:0030-drops-182492},
  doi =		{10.4230/DARTS.9.2.9},
  annote =	{Keywords: Session Types, Concurrency, Failure Handling, Code Generation, Scala}
}
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